What is a Y-Capacitor? Can I use another type of capacitor in my application?
Power conversion modules generally require bypass capacitors from line to chassis (earth ground) to meet Agency EMI Standards by shunting common-mode noise currents and keeping them local to the converter. In cases where the converters are operating from rectified AC line voltage, the failure of a bypass capacitor could result in excessive leakage current to the equipment chassis, thus creating a ground fault and shock hazard. For this reason, a special classification of capacitor, referred to as a “Y-capacitor” is recommended. These capacitors contain a dielectric with unique “self healing” properties to help prevent against excessive leakage. To meet general EMI/RFI requirements, Vicor recommends the use of Y-capacitors with all power conversion modules. Y-capacitors meet IEC384-14, EN132400 and UL1283 standards. All applications utilizing DC-DC converters should be properly bypassed, even if no EMC standards need to be met. Bypass power input and output pins to each module baseplate
